Logic Pro X - All Third Party AU Instruments Disable

I was able to finally solve my specific issue. I went through the extremely painful task of checking all 1700 of my plugins. Some did need updating. After the update I did a full audio unit reset, but that did not resolve the issue...but...the plugin manager had flagged six SSL plugins as incompatible. This was the first time after many resets that these plugins were flagged. I checked in iLok and they turned out to be expired demos. I went to the components folder and deleted them. I then did another full audio reset, restarted the computer and now my VIs reload as normal. Why expired effects plugin demos would stop VIs from reloading is a mystery that may never be known. To anyone else with this issue, the work I had to do to resolve it was hard...but, at least for my situation, it was worth it. I don't think there is any other way to solve except to go through every single plugin and do a full audio reset and reboot after each iteration where an issue with a plugin is discovered (or suspected since Logic did not catch the issues initially). Hope this helps.